Fog, Humidity, and a Soft Start to the Weekend Ahead
THUNDER BAY – WEATHER – Thunder Bay woke up under a soft, damp blanket this morning, with mist filling the air and 100% humidity wrapping the city in a cloak of early fall moisture. It’s the kind of morning that feels like your coffee should come with a side of poetry. But don’t worry—sunshine is doing its best to break through, and the weekend has warmer days in store.
Foggy Start with a Mild Finish
As of 7:26 AM EDT, conditions at Thunder Bay Airport are misty and damp, with a temperature of 11.5°C, matching the dew point—a clear indicator that the air is saturated. With visibility reduced to 5 km, commuters may need to flip on those fog lights this morning. A light northwest wind at 5 km/h isn’t doing much to stir things up just yet, but barometric pressure is holding steady at 102.7 kPa and rising, pointing to improving conditions later in the day.
Once the fog patches finally lift late this morning, the skies will remain mainly cloudy but dry, and the temperature is expected to reach a modest high of 19°C. The UV index sits at 5, so even through the cloud cover, the sun’s rays can still sneak in—especially during midday.
Fun fact: On this day in Thunder Bay’s weather history, the record high was 27.6°C, while the record low dipped to -1.5°C. So today’s middle-of-the-road forecast is a relatively comfortable version of September 11th!
Fog Returns Tonight with a Hint of Mystery
Tonight, skies will turn partly cloudy, then fully overcast, as fog patches redevelop near midnight. Winds will remain light, and the low will settle at 10°C—cool, but not quite sweater-worthy unless you’re out for a late walk or enjoying the stars between the clouds.
Friday Brings Clouds, Showers, and Maybe Thunder
Looking ahead to Friday, September 12, the fog will dissipate in the morning, but the cloud cover will stick around. There’s a 40 percent chance of afternoon showers, and a risk of thunderstorms to add some drama. The high will reach 18°C, with the UV index slightly lower at 4. Rain gear might be your best accessory.
Friday night remains mostly cloudy with a 30 percent chance of lingering showers, and temperatures will hold at a mild 12°C.
The Weekend Outlook: Cloudy with a Chance of Patio Weather
Saturday, September 13, will remain cloudy, but the temperature climbs to a more pleasant 22°C—the kind of day that calls for a walk along the Marina or a relaxed hike up Mount McKay. Saturday night sees cloudy periods and a low of 8°C, cool enough to crack the window open.
Sunday, September 14, brings a mix of sun and cloud and a high of 20°C—a calm, classic September day. Another cool but comfortable night follows, with lows once again at 8°C.
What to Wear?
You’ll want layers today: a light jacket or hoodie for the misty morning, with breathable layers underneath for the milder afternoon. Waterproof footwear might be smart tomorrow, and maybe a hat to deal with humidity-induced hair situations (Thunder Bay frizz is real).
Weather Trivia: Thunder Bay’s Foggy Fame
Did you know Thunder Bay averages over 50 foggy days a year? That’s thanks in large part to the massive presence of Lake Superior, which creates cool, moist air that collides with warmer inland conditions—ideal ingredients for fog. It’s one of the foggiest cities in Ontario!
